An electric current is passed through water and bubbles start forming.what is a logical conclusion for the bubbles?

a.water is evaporating
b.the water has impurities in it
c.a physical change has occured
d.hydrogen and oxygen are being formed
(will upvote)

Hydrogen and oxygen are being formed if an electric current is passed through water and bubbles start forming.

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3. All are hydrocarbons and all are in the eth- group i.e. all have two carbon atoms. Ethane is an alkane, ethene is an alkene and ethyne is an alkyne.
4. No C=C double bonds, only single C-C bonds. Saturated with hydrogen atoms (as many C-H bonds as possible).
5. As branching increases, boiling points decrease. (Molecules exert intermolecular forces of attraction between each other and these are stronger when they are closer together. Branching makes it harder for the hydrocarbon molecules to pack closely together therefore these forces are weaker and it takes lesser energy to break them.)